While the Pixel 6 ushered in three years of major Android OS version updates and an additional two for security patches, that’s still nowhere near the longevity of the iPhone. Google hopes to change that on the Pixel 8 and 8 Pro with noticeably more OS updates.
It’s fine to charge to 100. Just use a slow charger overnight. Heat is the real enemy. I always have an iPhone and Pixel. My 13 Pro Max is still at 100% battery health (at least it states that. Probably close to 99). I got it when it first came out. I use a ridiculously slow wireless charger. It takes like 3- 4 hours to charge which is perfect overnight. I only get 5-6 hours of sleep per night, so it works out great for me. I also never let it drop below 40% either. If I get close to that I slap it on the charger just enough to get to the overnight charge. That rarely happens.